JP6917372B2 - Medical long body - Google Patents

Description

The present invention relates to a medical elongate inserted into a living lumen.

A device having a tubular medical elongated body used for a catheter or the like has flexibility and torque transmission to the distal end so that it can reach a target site along its shape in the living lumen. There is a need. As a method of making the tubular medical elongated body flexible, a method of providing a spiral slit in the tubular body provided in the medical elongated body is known. However, the medical long body provided with the spiral slit becomes flexible while the axial expansion and contraction is promoted. In addition, medical long bodies are twisted due to the ability of the spiral to contract (strengthen winding) and expand (loose winding), resulting in torque transmission to the distal end. Tends to decline. For this reason, a medical long body that can reduce the easiness of twisting caused by the spiral slit is used. For example, Patent Document 1 describes a medical long body provided with a convex portion on one of a pair of facing surfaces forming a spiral slit and a concave portion on the other side of the facing surface in which the convex portion is accommodated. ing. In such a long medical body, since the convex portion is housed in the concave portion, the convex portion is caught in the circumferential direction with respect to the concave portion, and the occurrence of twisting can be suppressed.

International Publication No. 2014/174661

However, in the medical long body described in Patent Document 1, a portion where stress is concentrated is generated due to the provision of the convex portion and the concave portion, which may cause damage. Further, when the medical long body is bent, the convex portion partially or wholly comes out from the concave portion, so that it becomes difficult to suppress the twist and the torque transmissibility is lowered.

The present invention has been made to solve the above-mentioned problems, and can suppress twisting to improve torque transmission while maintaining high flexibility, and can disperse stress to suppress the occurrence of breakage. The purpose is to provide a medical long body.

A medical elongated body that achieves the above object is a medical elongated body having a tubular body provided with a spiral slit, and the tubular body has a pair of facing surfaces on both sides of the slit. The facing surface has a second side located on the opposite side of the slit from the first side and the first side, and the first convex portion protrudes from the first side. At the same time, the second convex portion protrudes from the second side, and the first convex portion and the second convex portion are adjacent to each other in the circumferential direction of the tubular body, and the first convex portion and the second convex portion are adjacent to each other. The base of the protrusion is located on a common spiral.

A medical elongated body that achieves the above object is a medical elongated body having a tubular body provided with a spiral slit, and the tubular body has a pair of facing surfaces on both sides of the slit. The facing surface has a second side located on the opposite side of the slit from the first side and the first side, and the first convex portion protrudes from the first side. At the same time, the second convex portion protrudes from the second side, and the first convex portion and the second convex portion are adjacent to each other in the circumferential direction of the tubular body, and the first convex portion and the second convex portion are adjacent to each other. The base of the convex portion is located on a common spiral, and the convex portion group including the first convex portion and the second convex portion adjacent to each other is relative to other convex portions arranged side by side in the circumferential direction. the arrangement of the first protrusion and the second protrusion is that it the opposite in the circumferential direction.

It is a top view which shows the medical long body which concerns on embodiment. It is a top view which shows the tubular body. It is a development view in the circumferential direction which shows a part of a tubular body. It is a perspective view which shows the 1st side of the facing surface of a tubular body. It is a perspective view which shows the 2nd side of the facing surface of a tubular body. It is a developed view which shows a part of the band part of a tubular body continuously in the circumferential direction. It is a development view in the circumferential direction which shows a part of the 1st modification of a tubular body. It is a development view in the circumferential direction which shows a part of the 2nd modification of a tubular body. It is a development view in the circumferential direction which shows a part of the 3rd modification of a tubular body. It is a development view in the circumferential direction which shows a part of the 4th modification of a tubular body. It is a development view in the circumferential direction which shows a part of the 5th modification of a tubular body. It is a development view in the circumferential direction which shows a part of the 6th modification of a tubular body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The dimensional ratios in the drawings may be exaggerated and differ from the actual ratios for convenience of explanation.

The medical elongated body 10 according to the present embodiment is used for a treatment of deep vein thrombosis, which is inserted into a blood vessel and crushes and removes the thrombus. In the present specification, the side of the device to be inserted into the blood vessel is referred to as the "distal side", and the hand side to be operated is referred to as the "proximal side".

As shown in FIG. 1, the medical long body 10 includes a long shaft portion 20 that is rotationally driven, an outer sheath 30 that can accommodate the shaft portion 20, and a crushing portion 40 that is rotated by the shaft portion 20. It has. The medical long body 10 further includes a rotary drive unit 50 including a drive source (for example, a motor) for rotating the shaft unit 20, and a hub 60 provided at the proximal end of the shaft unit 20. .. The crushed portion 40 is a plurality of elastically deformable wire rods. The configuration of the crushed portion 40 is not particularly limited as long as the substance in the lumen can be crushed. Lumens include blood vessels, arteries, veins, and vessels. The substance includes, but is not particularly limited, thrombus, plaque, fibrous substance or calcified substance, fibrous blood vessel, calcified blood vessel and the like.

The shaft portion 20 includes an outer pipe shaft 21 that is rotationally driven by the rotation drive unit 50, and an inner pipe shaft 22 that is arranged inside the outer pipe shaft 21 and to which the hub 60 is fixed to the proximal portion. The outer tube shaft 21 includes a tubular body 70 provided with a spiral slit 71 so that a rotational driving force can be transmitted while obtaining flexibility.

As shown in FIGS. 2 to 6, the tubular body 70 includes a flexible portion 72 on the distal end side provided with a spiral slit 71 and a highly rigid portion 73 on the proximal end side on which the slit 71 is not formed. There is. The slit 71 is formed by spiral slit processing using a commonly performed technique such as laser processing.

The flexible portion 72 is provided with a slit 71 at a predetermined pitch L1. The slit 71 is a linear notch penetrating from the outer peripheral surface to the inner peripheral surface of the tubular body 70. The slit 71 is continuous so as to draw a spiral while being curved so as to form a convex portion or a concave portion described later in the tubular body 70. The pitch L1 means the distance that the slit 71 moves in the axial direction X of the tubular body 70 by winding 360 degrees in the circumferential direction. The flexible portion 72 of the tubular body 70 has a flexible structure in which the bending rigidity is reduced and the tubular body 70 is easily bent by forming the slit 71. The tubular body 70 may have a multiple spiral structure by providing a plurality of spiral slits. The flexible portion 72 has one strip portion 200 which is a strip-shaped plate material between the slits 71 arranged in the axial direction X (see FIG. 6). The band portion 200 forms a flexible portion 72 in a spiral shape. When the tubular body 70 has a multiple spiral structure, the flexible portion is composed of a plurality of strip portions.

The slit 71 is composed of a pair of facing surfaces 100 and 110 arranged so as to face each other. The facing surface 100 (or facing surface 110) is located on the first side of the paired facing surfaces 100 and 110, and the facing surface 110 (or facing surface 100) is located on the second side. The first side of the facing surface can be the proximal side, the distal side or the circumferential side. The second side of the facing surface is the opposite side of the first side. The facing surface 100 is a proximal end surface (first side) of a spiral structure located between two slits 71 arranged in the axial direction. The facing surface 100 is a surface connecting the inner peripheral surface and the outer peripheral surface of the tubular body 70. The facing surface 100 extends in the circumferential direction along a spiral structure located between the slits 71. The facing surface 110 is a distal end surface (second side) of a spiral structure located between two slits 71 arranged in the axial direction. The facing surface 110 is a surface connecting the inner peripheral surface and the outer peripheral surface of the tubular body 70. The facing surface 110 extends in the circumferential direction along a spiral structure located between the slits 71. The facing surface 100 and the facing surface 110 are adjacent to each other (face each other) with the slit 71 in between. The facing surface 100 on the distal side is provided with a plurality of first convex portions 101 and a plurality of third convex portions 102 projecting to the proximal side. The facing surface 110 on the proximal side is provided with a plurality of first recesses 111 (recesses) into which the first convex portion 101 enters, and a plurality of third recesses 112 (recesses) into which the third convex portion 102 enters. There is. The first convex portion 101 is caught in the first concave portion 111, and the relative movement of the tubular body 70 in the axial direction X and the circumferential direction Y is restricted. The third convex portion 102 is caught in the third concave portion 112, and the relative movement in the axial direction X and the circumferential direction Y is restricted.

The slit 71 can be located in three parallel first spirals 81, second spiral 82 or third spiral 83 by drawing a spiral while curving in the tubular body 70. Each of the first spiral 81, the second spiral 82, and the third spiral 83 draws a spiral at a constant pitch along the axial direction. Therefore, the first spiral 81, the second spiral 82, and the third spiral 83 have a constant spiral angle with respect to the axial center of the tubular body 70. The top 102A of the third convex 102 and the base 101B of the first convex 101 are located on the first spiral 81. The top 101A of the first convex portion 101 is located on the second spiral 82. The base 102B of the third convex portion 102 is located on the third spiral 83. By locating the slits 71 in a plurality of spirals (first spiral 81, second spiral 82 or third spiral 83), the tubular body 70 becomes easy to bend with each of the spirals as a joint and becomes flexible.

Further, a linear first end face 101E is provided on the top 101A of the first convex portion 101. The plurality of first end faces 101E arranged in the circumferential direction Y are located on the second spiral 82. Further, a linear third end surface 102E is provided on the top 102A of the third convex portion 102. The plurality of third end faces 102E arranged in the circumferential direction Y are located on the first spiral 81.

The first convex portion 101 has a first wide portion 101F whose width is widened on the protruding side (proximal side). The first wide portion 101F has two first overhanging portions 101C protruding to both sides in the extending direction (circumferential direction Y) of the spiral. Further, the first convex portion 101 has a stepped portion 101D whose width in the circumferential direction changes in a stepped shape between the first overhanging portion 101C and the third spiral 83. Further, the third convex portion 102 has a third wide portion 102F whose width is widened on the protruding side (proximal side). The third wide portion 102F has two third overhanging portions 102C protruding to both sides in the extending direction (circumferential direction Y) of the spiral. The protruding side of the first convex portion 101 or the third convex portion 102 may be the distal side or the circumferential side.

The maximum width B1 in the circumferential direction Y of the first convex portion 101 is shorter than the minimum width B2 in the circumferential direction Y of the third convex portion 102. Then, a third convex portion 102 is arranged in the slit 71 adjacent to the protruding side of the first convex portion 101 so as to overlap the first convex portion 101 in the axial direction X. Therefore, the third convex portion 102 having a long circumferential direction Y is located on the protruding side of the first convex portion 101. The maximum width B1 of the first convex portion 101 is located within the range of the minimum width B2 of the third convex portion 102 adjacent to the protruding side of the first convex portion 101 in the circumferential direction Y. Therefore, it is possible to suppress the partial narrowing of the distance between the slit 71 adjacent to the axial direction X and the slit 71, and it is possible to suppress the occurrence of breakage. Further, since the tubular body 70 can suppress that the distance between the slits 71 and the slits 71 is partially narrowed, the easily bendable position is less likely to be biased in the circumferential direction Y, and an appropriate strength can be secured.

A plurality of second convex portions 113 and fourth convex portions 114 projecting to the distal side are provided on the facing surface 110 on the proximal side. The facing surface 100 on the distal side is provided with a plurality of second recesses 103 (recesses) into which the second convex portion 113 enters and a plurality of fourth recesses 104 (recesses) into which the fourth convex portion 114 enters. There is. The second convex portion 113 is caught in the second concave portion 103, and the relative movement in the axial direction X and the circumferential direction Y is restricted. The fourth convex portion 114 is caught in the fourth concave portion 104, and the relative movement in the axial direction X and the circumferential direction Y is restricted.

The base 113B of the second convex 113 and the top 114A of the fourth convex 114 are located on the first spiral 81. The top 114A is provided with a linear fourth end face 114E. The top 113A of the second convex 113 is located on the third spiral 83. The top 113A is provided with a linear second end face 113E. The base 114B of the fourth convex portion 114 is located on the second spiral 82.

The second convex portion 113 has a second wide portion 113F whose width is widened on the protruding side (distal side). The second wide portion 113F has two second overhanging portions 113C protruding to both sides in the extending direction (circumferential direction Y) of the spiral. Further, the second convex portion 113 has a step portion 113D whose width in the circumferential direction changes in a step shape on one of the second overhanging portions 113C. Further, the fourth convex portion 114 has a fourth wide portion 114F whose width is widened on the protruding side (distal side). The fourth wide portion 114F has two fourth overhanging portions 114C protruding to both sides in the extending direction (circumferential direction Y) of the spiral.

The first spiral 81 is a spiral (basic spiral) having the highest ratio of slits 71 present. The presence of the basic spiral, which has a high proportion of the slits 71, makes it possible to minimize the bias of the direction with respect to the flexibility. The second helix 82 and the third helix 83 sandwich the first helix 81. The axial distance L2 between the first spiral 81 and the second spiral 82 is equal to the axial distance L3 between the first spiral 81 and the third spiral 83. The distance L2 and the distance L3 may be different. The distance L2 and the distance L3 are preferably, but are not limited to, half or less of the pitch L1 of the first spiral 81 (basic spiral). When the distance L2 and the distance L3 are less than half of the pitch L1 of the basic spiral, it is possible to suppress the possibility that the distance between the two slits 71 arranged in the axial direction X becomes too narrow, and between the two slits 71. The width of the material can be maintained. Thereby, the tubular body 70 can secure an appropriate strength. Further, the distance L2 and the distance L3 are not too small to some extent so as to secure the strength of the first convex portion 101, the third convex portion 102, the second convex portion 113, and the fourth convex portion 114. It is preferable that the length is secured. The pitch L1 is not particularly limited, but is, for example, 0.5 mm to 2.5 mm. The distance L2 and the distance L3 are not particularly limited, but are, for example, 0.25 mm to 1.25 mm.

On the distal facing surface 100, a set of two first convex portions 101 and one third convex portion 102 are arranged alternately along a spiral. Further, on the facing surface 110 on the proximal side, a set of two second convex portions 113 and one fourth convex portion 114 are arranged alternately along a spiral.

The first convex portion 101 of the facing surface 100 on the distal side and the second convex portion 113 of the facing surface 110 on the proximal side are arranged in pairs adjacent to each other in the circumferential direction Y. The convex portion group 120 composed of the adjacent first convex portion 101 and the second convex portion 113 is provided every 240 degrees in the circumferential direction Y along the basic spiral. In the convex portion group 120 adjacent to the circumferential direction Y, the arrangement of the first convex portion 101 and the second convex portion 113 is switched in the circumferential direction Y. Therefore, the two convex portions 120 adjacent to each other in the circumferential direction Y are line-symmetric with respect to the orthogonal line Z located at the center of the two convex portions 120 and orthogonal to the spiral in the developed view.

Further, the adjacent first convex portion 101 and the second convex portion 113 of each convex portion group 120 have a point-symmetrical shape with respect to a point located in the vicinity of the step portion 101D in the developed view. That is, the first convex portion 101 and the second convex portion 113 have the same size and shape, but differ only in the orientation. Therefore, the second convex portion 113 has a similar configuration having a different orientation from that of the first convex portion 101. The same size means that the dimensions are the same. Further, the same shape means that the shapes are similar in the developed view.

The convex portion group 120 is located every 240 degrees in the circumferential direction Y along the first spiral 81 (basic spiral). Therefore, the convex portion group 120 does not line up along the axial direction X in the two slits 71 adjacent to each other in the axial direction X by winding. Since the convex portion groups 120 are located every 240 degrees in the circumferential direction Y, they are lined up with one slit 71 sandwiched in the axial direction X. In the two convex portions 120 arranged so as to sandwich one slit 71 in the axial direction X, the arrangement of the first convex portion 101 and the second convex portion 113 is reversed in the circumferential direction Y.

The constituent material of the tubular body 70 is preferably a material having relatively high rigidity, and for example, a metal such as Ni—Ti, brass, SUS, or aluminum is preferably used. The constituent material of the tubular body 70 is not particularly limited as long as it is a material having relatively high rigidity, and may be, for example, a resin such as polyimide, vinyl chloride, or polycarbonate.

The dimensions of the tubular body 70 are not particularly limited. For example, the outer diameter of the tubular body 70 is about 0.5 mm to 3.5 mm, the wall thickness is about 10 μm to 500 μm, and the length is about 100 mm to 5000 mm.

The gap between the slits 71 (the distance between the facing surface 100 and the facing surface 110) is not particularly limited, but is, for example, about 0.01 mm to 0.05 mm.

Next, a method of using the medical long body 10 according to the present embodiment will be described by taking as an example a case where a substance in a vein is crushed and sucked.

When the medical elongated body 10 of the present embodiment is used, the medical elongated body 10 is prepared in a state where the distal portion of the shaft portion 20 including the crushed portion 40 is housed in the outer sheath 30. The crushed portion 40 is elastically deformed and contracted in the outer sheath 30.

Next, a guide wire (not shown) is inserted into the blood vessel, and the medical elongated body 10 is brought to the proximal side of the substance using the guide wire as a guide. After that, when the outer sheath 30 is moved to the proximal side with respect to the shaft portion 20, the crushed portion 40 is exposed to the outside of the outer sheath 30 and expands by its own elastic force.

Next, when the shaft portion 20 is rotated by the rotation driving unit 50 in a state where the crushing portion 40 has entered the vicinity of the substance, the crushing portion 40 also rotates accordingly. When the crushed portion 40 is moved in the blood vessel in this state, the crushed portion 40 comes into contact with the substance, and the crushed portion 40 crushes the substance in a state of being fixed in the blood vessel. The rotation of the crushing portion 40 is a reciprocating rotation, but it may rotate continuously in one direction.

Next, the syringe is connected to the hub 60 and the pusher is pulled to bring the hollow inside of the shaft portion 20 into a negative pressure state. As a result, the crushed substance floating in the blood vessel can be sucked and discharged to the outside of the blood vessel from the opening 23 located at the distal portion of the shaft portion 20. After the suction of the substance is completed, the rotary drive unit 50 is operated to stop the rotary motion. After that, the crushed portion 40 is housed in the outer sheath 30 and contracted, and the medical long body 10 is removed from the blood vessel to complete the procedure.

It is also possible to provide a side hole at the hand portion of the outer sheath 30 and connect a syringe to the side hole to suck the substance from the tip of the outer sheath 30. It is also possible to pull out the crushed portion 40 and the shaft portion 20 from the outer sheath 30 after crushing the substance, and connect a syringe to the hub of the outer sheath 30 to suck the substance.

As described above, the medical elongated body 10 according to the embodiment has a tubular body 70 provided with a spiral slit 71, and the tubular body 70 has facing surfaces 100 paired on both sides of the slit 71. 110, the facing surface has a second side on the opposite side with the slit 71 sandwiched between the first side and the first side, and the first convex portion 101 projects from the first side. At the same time, the second convex portion 113 protrudes from the second side, the first convex portion 101 and the second convex portion 113 are adjacent to each other in the circumferential direction of the tubular body 70, and the first convex portion 101 and the second convex portion 101 and the second convex portion 113 are adjacent to each other. The base portions 101B and 113B of the convex portion 113 of the above are located on a common first spiral 81 (spiral). The first spiral 81 is a spiral (basic spiral) having the highest ratio of slits 71 present. The first spiral 81 has a constant spiral angle with respect to the axial center of the tubular body 70. The first side of the facing surface may be the proximal side, the distal side, or the circumferential side. The second side of the facing surface is the opposite side of the first side. The medical long body 10 configured as described above has high flexibility because the base portions 101B and 113B of the first convex portion 101 and the second convex portion 113 are located on the common first spiral 81. Further, by providing the adjacent first convex portion 101 and the second convex portion 113 on the facing surfaces 100 and 110, the medical long body 10 has the first convex portion 101 and the first convex portion 101 having two rotational forces. It is dispersed in the second convex portion 113 and acts uniformly. Therefore, the medical long body 10 can suppress twisting to improve torque transmissibility, and can disperse stress to suppress the occurrence of breakage. In particular, since the tubular body 70 is a member for rotating and transmitting a rotational force, twisting can be suppressed, so that operability can be improved. Further, the medical long body 10 has an improved torque transmission ability, so that when the crushing portion 40 receives an excessive resistance at the time of crushing, the resistance is effectively transmitted to the proximal side and an emergency stop can be performed. It is possible.

Further, the first convex portion 101 and the second convex portion 113 adjacent to each other in the circumferential direction have a point-symmetrical shape in the circumferential development view. As a result, in the medical long body 10, the rotational force is distributed to the first convex portion 101 and the second convex portion 113 in a well-balanced manner, so that the torque transmission property can be improved and the occurrence of breakage can be further suppressed.

Further, the width of the first convex portion 101 and the second convex portion 113 in the circumferential direction is widened on the protruding side. As a result, the first convex portion 101 is hooked on the facing surface 110 side, and the second convex portion 113 is hooked on the facing surface 100 side. Therefore, the tubular body 70 is caught in both the axial direction X and the circumferential direction Y, and can suppress stretching and twisting.

Further, the convex portion group 120 including the adjacent first convex portion 101 and the second convex portion 113 has the first convex portion 101 and the convex portion group 120 with respect to the other convex portion groups 120 arranged side by side in the circumferential direction. The arrangement of the second convex portion 113 is reversed in the circumferential direction. As a result, the bias of the arrangement of the first convex portion 101 and the second convex portion 113 can be suppressed, and the bias of the flexibility in the circumferential direction Y can be reduced.

Further, the width of the first convex portion 101 and the second convex portion 113 is widened stepwise in two or more steps in the projecting direction. As a result, the first convex portion 101 and the second convex portion 113 are likely to be caught by each other. Therefore, the medical long body 10 can further suppress stretching and twisting.

Further, the first end surface 101E on the protruding side of the first convex portion 101 and the second end surface 113E on the protruding side of the second convex portion 113 are the base portions of the first convex portion 101 and the second convex portion 113. Is parallel to the first spiral 81 (basic spiral) in which is commonly located. As a result, the tubular body 70 bends not only at the position of the first spiral 81 but also at the position of the first end face 101E (second spiral 82) and the position of the second end face 113E (third spiral 83). Becomes easier. Therefore, the tubular body 70 has increased flexibility and improved operability.

Further, the first convex portion 101 and the second convex portion 113 are located at positions different from those of the other first convex portion 101 and the second convex portion 113 provided in the slit 71 adjacent to the axial direction X in the circumferential direction Y. Is placed in. As a result, the first convex portion 101 and the second convex portion 113 are not continuously arranged in the axial direction X. Therefore, the flexibility of the tubular body 70 is less likely to be biased in the circumferential direction Y, the bending position can be easily adjusted, and the operability is improved.

Further, the first side further has a third convex portion 102 projecting toward the second side, and the first convex portion 101 projects toward the second side and widens on the protruding side. The third wide portion 102F has a first wide portion 101F, and the third convex portion 102 protrudes to the second side and has a third wide portion 102F having a width widened on the protruding side, and has a second facing surface. Side has a first concave portion 111 and a third concave portion 112 that accommodate the first convex portion 101 and the third convex portion 102 so as to surround the first convex portion 101 and the third convex portion 102. Is different in at least one of size and shape. The first side of the facing surface may be the proximal side, the distal side, or the circumferential side. The second side of the facing surface is the opposite side of the first side. As a result, in the medical long body 10, the first wide portion 101F of the first convex portion 101 and the third wide portion 102F of the third convex portion 102 have the first concave portion 111 and the third concave portion. It is caught in both the axial direction X and the circumferential direction Y with respect to 112. Therefore, the medical long body 10 suppresses the occurrence of elongation and twist in the axial direction X, and the torque transmission property is improved. Further, since at least one of the first convex portion 101 and the third convex portion 102 is different in size and shape, the shape bias (anisotropic) is reduced, and the flexibility bias in the circumferential direction Y is reduced. Can be reduced. In particular, since the tubular body 70 is a member for rotating and transmitting a rotational force, the anisotropy of torque transmission in the circumferential direction is suppressed as much as possible by maintaining flexibility that is as unbiased as possible in the circumferential direction. The operability can be improved. Here, the first convex portion 101 and the third convex portion 102 of the facing surface 100 on the distal side are housed in the first concave portion 111 and the third concave portion 112 of the facing surface 110 on the proximal side. Explains the configuration. However, for a configuration in which the second convex portion 113 and the fourth convex portion 114 of the proximal side facing surface 110 are housed in the second concave portion 103 and the fourth concave portion 104 of the distal side facing surface 100. Has a similar effect. Further, the medical long body 10 has an improved torque transmission ability, so that when the crushing portion 40 receives an excessive resistance at the time of crushing, the resistance is effectively transmitted to the proximal side and an emergency stop can be performed. It becomes easier and safety is improved. The first wide portion 101F may have the same shape and size as the third wide portion 102F, or may be different.

Further, the projecting direction ends of the first convex portion 101 and the third convex portion 102 adjacent to the circumferential direction Y are located on different spirals wound along the tubular body 70. As a result, the tubular body 70 can be bent at both the position of the protruding direction end portion of the first convex portion 101 and the position of the protruding direction end portion of the third convex portion 102, and the flexibility is increased.

Further, the first end surface 101E on the protruding side of the first convex portion 101 and the third end surface 102E on the protruding side of the third convex portion 102 are at least the first convex portion 101 and the third convex portion 102. It is parallel to a third spiral 83 (spiral) that winds in a spiral with one base located. As a result, the tubular body 70 has a smaller resistance when bent at the position of the first end face 101E and the position of the third end face 102E, and the flexibility is increased and the operability is improved.

Further, the second spiral 82 (spiral) in which the plurality of first end faces 101E are lined up is arranged at a position different from that of the first spiral 81 (spiral) in which the plurality of third end faces 102E are lined up. As a result, the tubular body 70 can be bent at both the position of the first end face 101E and the position of the third end face 102E, and the flexibility is increased.

Further, the first convex portion 101 is arranged at a position different from that of the other first convex portion 101 provided in the slit 71 adjacent to the axial direction X in the circumferential direction Y. As a result, since the first convex portion 101 is not continuously arranged in the axial direction X, the flexibility of the tubular body 70 is less likely to be biased in the circumferential direction Y, the bending position can be easily adjusted, and the operability is improved. do.

Further, the first convex portion 101 has a shorter length in the circumferential direction Y than the third convex portion 102, and the first convex portion 101 is formed in the slit 71 adjacent to the protruding side of the first convex portion 101. The third convex portion 102 is located so as to overlap the axial direction X. As a result, the third convex portion 102 having a long circumferential direction Y is located on the protruding side of the first convex portion 101, so that the distance between the two slits 71 adjacent to the axial direction X is partial. It is possible to suppress the narrowing. Therefore, the easily bendable position of the tubular body 70 is less likely to be biased in the circumferential direction Y, and an appropriate strength can be secured.

Further, the maximum width B1 in the circumferential direction Y of the first convex portion 101 is shorter than the minimum width B2 in the circumferential direction Y of the third convex portion 102, and the slit 71 adjacent to the protruding side of the first convex portion 101. A third convex portion 102 is arranged so as to overlap the first convex portion 101 in the axial direction X. As a result, the third convex portion 102 having a long circumferential direction Y is located on the protruding side of the first convex portion 101, so that the distance between the slits 71 adjacent to the axial direction X is partially narrowed. It can be suppressed. Therefore, the easily bendable position of the tubular body 70 is less likely to be biased in the circumferential direction Y, and an appropriate strength can be secured.

Further, the first convex portion 101 and the third convex portion 102 adjacent to each other in the circumferential direction are formed in the slit 71 while the arrangements of the first convex portion 101 and the third convex portion 102 in the circumferential direction Y are alternately alternated. They are arranged side by side in the circumferential direction Y along the line. As a result, the easily bendable position of the tubular body 70 is less likely to be biased in the circumferential direction Y, the bending position can be easily adjusted, and the operability is improved.

Further, as shown in FIG. 6, the medical elongated body 10 according to the embodiment is a medical elongated body 10 having a tubular body 70 provided with a band portion 200 which is a plate material extending in a spiral shape. The band portion 200 has two side surfaces connecting an inner peripheral surface located on the inner surface side of the tubular body 70, an outer peripheral surface located on the outer surface side of the tubular body 70, an inner peripheral surface, and an outer peripheral surface, and the side surface is a mountain. It has a shape 201, a valley shape 202, and a straight shape 203, and the mountain shape 201 and the valley shape 202 are adjacent to each other, and have a plurality of irregularities 204 including the adjacent mountain shape 201 and the valley shape 202, and the straight shape 203. Connects the unevenness 204. In the medical long body 10 configured as described above, by providing the adjacent mountain shape 201 and valley shape 202 on the side surface of the band portion 200, the rotational force acting on the medical long body 10 is 2 It is dispersed in one mountain shape 201 (the mountain shape 201 and the other mountain shape 201 accommodated in the valley shape 202 adjacent to the mountain shape 201) and acts uniformly. Therefore, the medical long body 10 can suppress twisting to improve torque transmissibility, and can disperse stress to suppress the occurrence of breakage. In particular, since the tubular body 70 is a member for rotating and transmitting a rotational force, twisting can be suppressed, so that operability can be improved. Further, the medical long body 10 has an improved torque transmission ability, so that when the crushing portion 40 receives an excessive resistance at the time of crushing, the resistance is effectively transmitted to the proximal side and an emergency stop can be performed. It is possible.

Further, in the mountain shape 201 and the valley shape 202, the width of the band portion 200 in the extending direction is widened on the top side of the mountain or the bottom side of the valley. Therefore, the mountain shape 201 is caught in both the axial direction X and the circumferential direction Y with respect to the valley shape 202 accommodating the mountain shape 201. Therefore, the medical long body 10 suppresses the occurrence of elongation and twist in the axial direction X, and the torque transmission property is improved.

Further, the mountain shape 201 and the valley shape 202 are fitted by arranging the band portions 200 in a spiral shape. Therefore, the mountain shape 201 is likely to be caught in both the axial direction X and the circumferential direction Y with respect to the valley shape 202 accommodating the mountain shape 201. Therefore, the medical long body 10 suppresses the occurrence of elongation and twist in the axial direction X, and the torque transmission property is improved.

Further, the mountain shape 201 and the valley shape 202 have substantially the same shape. Therefore, the mountain shape 201 can be fitted well to the valley shape 202. Therefore, the mountain shape 201 and the valley shape 202 are likely to be caught in both the axial direction X and the circumferential direction Y. Therefore, the medical long body 10 suppresses the occurrence of elongation and twist in the axial direction X, and the torque transmission property is improved.

Further, the mountain shape 201 has a top surface 201A and the valley shape 202 has a bottom surface 202A, and in the circumferential development view of the tubular body, the first line S1 in which the linear shape 203 is located and the second line S1 in which the top surface 201A is located are located. The positions of the line S2 and the third line S3 on which the bottom surface 202A is located are different. As a result, the tubular body 70 becomes easy to bend at the positions of the first line S1, the second line S2, and the third line S3, and the flexibility is increased. The first line S1 is provided at a position corresponding to the first spiral 81. The second line S2 is provided at a position corresponding to the second spiral 82. The third line S3 is provided at a position corresponding to the third spiral 83.

The present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art within the technical idea of the present invention. For example, as shown in FIG. 7, in the tubular body 130 which is the first modification, the winding direction of the slit 131 may be opposite to that of the above embodiment.

Further, as shown in FIG. 8, in the tubular body 140 which is the second modification, the shapes of the two overhanging portions 142 and 143 provided on the first convex portions 141 are different, and the second convex portion is formed. The shapes of the two overhanging portions 145 and 146 provided on the portion 144 may be different. The parts having the same function are designated by the same reference numerals, and the description thereof will be omitted.

Further, as shown in FIG. 9, the tubular body 150, which is a third modification, has one overhanging portion 152 instead of two in each first convex portion 151, and the second convex portion 153. May have one overhang 154.

Further, as shown in FIG. 10, in the tubular body 160 which is the fourth modification, the arrangement of the first convex portion 163 and the second convex portion 164 which are provided on the facing surfaces 161 and 162 and are adjacent to each other is arranged. It may not be arranged upside down in the circumferential direction and may always be the same arrangement.

Further, as shown in FIG. 11, in the tubular body 170 which is the fifth modification, the pitch L1 of the slit 171 may change along the axial direction X. For example, by gradually narrowing the pitch L1 of the slit 171 toward the distal side, the bending rigidity can be lowered toward the distal side. As a result, the tubular body 170 can secure sufficient pushability by the proximal side portion having high flexural rigidity, and can easily pass through the curved portion of the biological lumen by the flexible distal side portion, which is high. Reachability and operability can be obtained at the same time. The first helix 81, the second helix 82, and the third helix 83, like the slit 171, gradually change along the axial direction. Further, the size and shape of the first convex portion 172, the second convex portion 174, the third convex portion 173, and the fourth convex portion 175 may differ depending on the position in the axial direction X. For example, in the proximal portion where the pitch L1 is large, since the pitch L1 has a margin, the first convex portion 172, the second convex portion 174, the third convex portion 173, and the fourth convex portion 175 should be increased. Can be done. The pitch L1 of the slit 171 may change in an inclined manner. As a result, the tubular body can obtain higher reachability and operability, stress is not concentrated in one place, and breakage and kink generation can be reduced. Further, the pitch L1 of the slit may be shorter toward the proximal side. Further, the size and shape of the first convex portion, the second convex portion, the third convex portion and the fourth convex portion may be smaller toward the proximal side.

Further, as shown in FIG. 12, the tubular body 180, which is a sixth modification, has the first convex portion 181 and the third convex portion 182, the second convex portion 183, and the fourth convex portion 184. It is not necessary to provide a wide portion having a wide width.

Further, the medical elongated body 10 according to the present embodiment is a device for removing a thrombus intravenously, but is not particularly limited as long as it is a medical elongated body. For example, the medical elongated body may be an atherectomy device for scraping a calcified lesion in an artery, a catheter for other purposes such as a microcatheter or an imaging catheter, a guide wire, or the like.

Further, the first convex portion and the third convex portion of the tubular body may not be arranged with regularity or may be arranged at random. As a result, the anisotropy of the flexural rigidity of the tubular body in the circumferential direction can be reduced. By arranging the first convex portion and the third convex portion of the tubular body with regularity, the bending direction can be systematically adjusted.

Furthermore, this application is based on Japanese Patent Application Nos. 2016-142312 and Japanese Patent Application Nos. 2016-142313 filed on July 20, 2016, the contents of which are disclosed by reference and as a whole. It is incorporated.

10 Medical long body,
20 shaft part,
70, 130, 140, 150, 160, 170, 180 tubular body,
71 slit,
81 First spiral,
82 Second spiral,
83 Third spiral,
100, 110, 161, 162 facing surfaces,
101, 141, 151, 163, 172, 181 First convex part,
102, 173, 182 Third convex part,
101A, 102A, 113A, 114A top,
101B, 102B, 113B, 114B base,
101D, 113D stepped part,
101E 1st end face,
101F 1st wide part,
102E Third end face,
102F 3rd wide part,
103 Second recess (recess, groove),
104 Fourth recess (recess),
111 First recess (recess),
112 Third recess (recess),
113, 144, 153, 164, 174, 183 Second convex part,
113E Second end face,
113F 2nd wide part,
114, 175, 184 4th convex part,
114E 4th end face,
114F 4th wide part,
120 convex group,
131, 171 slits,
200 band,
201 mountain shape,
201A top surface,
202 valley shape,
202A bottom,
203 linear shape,
204 unevenness,
B1 maximum width,
B2 minimum width,
L1 pitch,
L2 distance,
L3 distance,
S1 first line,
S2 second line,
S3 third line,
X-axis direction,
Y circumference direction,
Z Orthogonal line.

Claims (18)

A medical long body having a tubular body provided with a spiral slit.
The tubular body has paired facing surfaces on both sides of the slit.
The facing surface has a first side and a second side located on the opposite side of the slit with respect to the first side.
The first convex portion protrudes from the first side, the second convex portion protrudes from the second side, and the first convex portion and the second convex portion project in the circumferential direction of the tubular body. Adjacent, the first convex and the base of the second convex are located on a common spiral .
The convex portion group including the first convex portion and the second convex portion adjacent to each other has the first convex portion and the second convex portion with respect to other convex portions arranged side by side in the circumferential direction. medical long body arrangement of that has become opposite in the circumferential direction. The medical long body according to claim 1, wherein the first convex portion and the second convex portion adjacent to each other in the circumferential direction have a point-symmetrical shape in the circumferential development view. The medical elongated body according to claim 1 or 2, wherein the first convex portion and the second convex portion have a width in the circumferential direction on the protruding side. The medical long body according to any one of claims 1 to 3 , wherein the first convex portion and the second convex portion have a stepwise width of two or more steps toward the protruding direction. The first side further has a third convex portion that projects toward the second side.
The first convex portion has a first wide portion that protrudes to the second side and is widened on the protruding side.
The third convex portion has a third wide portion that protrudes to the second side and is widened on the protruding side.
The second side of the facing surface has a concave portion that surrounds and accommodates the first convex portion and the third convex portion.
The medical elongated body according to any one of claims 1 to 4 , wherein the first convex portion and the third convex portion differ in at least one of a size and a shape. The medical elongate according to claim 5 , wherein the projecting direction ends of the first convex portion and the third convex portion adjacent to each other in the circumferential direction are located on different spirals wound along the tubular body. .. The first end face on the protruding side of the first convex portion and the third end face on the protruding side of the third convex portion are positioned at the base of at least one of the first convex portion and the third convex portion. The medical elongate according to claim 5 or 6 , which is parallel to the spirally wound spiral. The medical elongate according to claim 7 , wherein the plurality of spirals in which the first end faces are lined up are arranged at different positions from the spirals in which the plurality of third end faces are lined up. The medical length according to any one of claims 5 to 8 , wherein the first convex portion is arranged at a position different in the circumferential direction from another first convex portion provided in a slit adjacent in the axial direction. Scale body. The first convex portion has a shorter circumferential length than the third convex portion, and vertically overlaps the first convex portion in a slit adjacent to the protruding side of the first convex portion. The medical long body according to any one of claims 5 to 9 , wherein the third convex portion is provided. The maximum width of the first convex portion in the circumferential direction is shorter than the minimum width of the third convex portion in the circumferential direction, and the first convex portion is formed in a slit adjacent to the protruding side of the first convex portion. medical long body according to claim 1 0 third protrusion is arranged so as to overlap in part in the axial direction. The first convex portion and the third convex portion adjacent to each other in the circumferential direction are arranged in the circumferential direction along the slit while alternately arranging the first convex portion and the third convex portion in the circumferential direction. The medical long body according to any one of claims 5 to 11 arranged in. A medical long body having a tubular body provided with a band portion which is a plate material extending in a spiral shape.
The band has two sides and has two sides.
The side surface has a mountain shape, a valley shape, and a straight shape.
The mountain shape and the valley shape are adjacent to each other, and have a plurality of irregularities including the adjacent mountain shape and the valley shape, and the linear shape connects the unevenness .
The mountain shape and a valley-shaped, substantially the same shape der Ru medical long body. The mountain shape and a valley shape, at the top side or the valley of the bottom side of the mountain, a medical long body according to claims 1 to 3, the extending direction of the width of the band portion extends. The mountain shape and a valley shape, the medical long body according to claim 1 3 or 1 4, wherein the belt part is fitted by being arranged helically. The mountain shape has a top surface and the valley shape has a bottom surface.
In the circumferential development view of the tubular body, the first line where the linear shape is located, the second line where the top surface is located, and the third line where the bottom surface is located are located at different positions 1 3 to 3 The medical long body according to any one of 1-5. A medical long body having a tubular body provided with a spiral slit.
The tubular body has paired facing surfaces on both sides of the slit.
The facing surface has a first side and a second side located on the opposite side of the slit with respect to the first side.
The first convex portion protrudes from the first side, the second convex portion protrudes from the second side, and the first convex portion and the second convex portion project in the circumferential direction of the tubular body. Adjacent, the first convex and the base of the second convex are located on a common spiral.
The first convex portion and the second convex portion are medical long bodies whose widths are stepwise widened in two or more steps toward the protruding direction. A medical long body having a tubular body provided with a band portion which is a plate material extending in a spiral shape.
The band has two sides and has two sides.
The side surface has a mountain shape, a valley shape, and a straight shape.
The mountain shape and the valley shape are adjacent to each other, and have a plurality of irregularities including the adjacent mountain shape and the valley shape, and the linear shape connects the unevenness.
The mountain shape and the valley shape are long medical bodies whose widths are stepwise widened in two or more steps in the protruding direction or the direction toward the bottom.

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